Question # 1

Hydrogen bomb is based on

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Controlled chain reaction

Uncontrolled chain reaction

Nuclear fusion

Nuclear fission

The mass of an helium nucleus is equal to.

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2.0015 u

3.0015 u

4.0015 u

5.0015 u

Which of the following is the most massive particle.

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Deuteron

Alpha particle

Neutron

positron

When using the formula E = h lambda what unit should energy have.

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Joule

Watt second

Newton metre

Electron volt

The input resistance of a JFET is of the order of.

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1 M Mega

10 M Mega

100 M Mega

1,000 M Mega

Emitter follower amplifier is an example of.

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Current series feedback

Voltage series feedback

Current shunt feed back

Voltage shunt feedback

Which of the following is deflected by an electric field.

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Alpha particles

X rays

Gama rays

Neutrons

Specially designed solid state detector can be used to detect.

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Alpha particles

Beta particles

Gama rays

X- rays

The input exultation for a JFET is

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Current signal

Voltage signal

Voltage and current signals

Neither voltage nor current signal

In CC configuration voltage gain is.

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Less than one

More than one

One

Zero

Which of the following is not an electromagnetic wave.

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game rays

Ultraviolet rays

Ultrasonic waves

Microwaves

The rest mass of a particle is independent of the

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Wavelength of the particle

Mass of the particle

Speed of the particle

Energy of the particle

A darling ion amplifier is characterized by

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High voltage and current gain

High input resistance and current gain

High output resistant and current gain

Low input resistance and current gain

An Alpha particle is the same as

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A helium nucleus

A high speed electron

A hydrogen nucleus

Electromagnetic radiation of short wavelength

In scattering experiment which force scatters alpha particle.

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Nuclear force

Coulomb's force

Gravitational force

Centripetal force

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

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25 g

50 g

75 g

100 g

In a nuclear reactor chani reaction is controlled by introducing.

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Iron rods

Cadmium rods

Graphite rods

Platinum rods

Which of the following is required for maintaining sustained chain reaction.

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Neutrons

Protons

Electrons

Photons

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

What is the overall gain, if three amplifiers each with a gain of 30 are cacaded.

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30

90

270

27,000

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